[vsnet-grb-info 20281] GRB 180204A: Enhanced Swift-XRT position
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sun Feb 4 19:48:19 JST 2018
TITLE: GCN CIRCULAR
NUMBER: 22377
SUBJECT: GRB 180204A: Enhanced Swift-XRT position
DATE: 18/02/04 10:47:55 GMT
FROM: Phil Evans at U of Leicester <pae9 at leicester.ac.uk>
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester)
report on behalf of the Swift-XRT team.
Using 6274 s of XRT Photon Counting mode data and 9 UVOT
images for GRB 180204A, we find an astrometrically corrected X-ray
position (using the XRT-UVOT alignment and matching UVOT field sources
to the USNO-B1 catalogue): RA, Dec = 330.13329, +30.83785 which is equivalent
to:
RA (J2000): 22h 00m 31.99s
Dec (J2000): +30d 50' 16.2"
with an uncertainty of 1.4 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest
position can be viewed at http://www.swift.ac.uk/xrt_positions. Position
enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans
et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the
Swift-XRT team.
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